使用socket实现的ftp文件传输服务器

服务端：

 # encoding:utf-8
 # Author:"richie"
 # Date:8/23/2017

 from socket import *
 import pickle
 import os

 server=('127.0.0.1',17001)
 root_path= os.path.abspath(os.curdir) # The absolute path of the current folder
 sock = socket(AF_INET, SOCK_STREAM)
 sock.bind(server)
 sock.listen(5)
 print('Wait for the client connection!!!')
 while True: # Link cycle
     conn, addr = sock.accept() #Waiting for client connection
     print('Connect by',addr)
     while True:    # Communication cycle
         try:
             data = conn.recv(1024) # Receive client data
             if not data: break
             filename = data.decode('utf-8') # Bytes -> String
             file_path = os.path.join(root_path,filename) # join path
             # get file size if file not existed file size is zero
             file_size = os.path.getsize(file_path) if os.path.exists(file_path) else 0
             header = pickle.pack('q', file_size)  # pack header
             conn.send(header)   # send header
             if file_size:   #The file exists and size than 0
                 with open(file_path,'rb') as f:
                     for line in f:
                         conn.send(line)   # send line of file data
             else:
                 conn.send(b'')
         except ConnectionResetError as e:  # conn　abnormal
             break
         except Exception as e:
             print(e)
     conn.close()

客户端

 # encoding:utf-8
 # Author:"richie"
 # Date:8/23/2017

 from socket import *
 import pickle,sys
 import os
 def progress(percent,width=250):
     if percent >= 100:
         percent=100
     show_str=('[%%-%ds]' %width) %(int(width * percent / 100) * "#") #字符串拼接的嵌套使用
     print("\r%s %d%%" %(show_str, percent),end='',file=sys.stdout,flush=True)

 server=('127.0.0.1',17001)
 sock = socket(AF_INET,SOCK_STREAM)
 sock.connect(server)
 root_path= os.path.abspath(os.curdir) # The absolute path of the current folder

 while True:
     print('The current home path is '+root_path)
     filename = input('Please enter the path>>:').strip()
     if not filename:continue
     sock.send(filename.encode('utf-8'))
     header = sock.recv(8) # Receive the header
     total_size = pickle.unpack('q',header)[0] # get header data
     each_recv_size = 1024*8421
     recv_size = 0
     recv_data = b''
     down_filename = 'down_'+filename
     f = open(down_filename,'wb')
     while recv_size < total_size:
         if total_size - recv_size < each_recv_size:
             data = sock.recv(total_size - recv_size)
         else:
             data = sock.recv(each_recv_size)
         recv_size += len(data)
         recv_percent = int(100 * (recv_size / total_size))  # Receive the percent
         progress(recv_percent, width=30)  # The width of the progress bar is 30
         f.write(data)
     print()
     f.close()